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Allowance for Credit Losses, Credit Quality and Other - Presentation of TDR's on Non-Accrual Status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 254	$ 313
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		105
Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		9
Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		29
Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	2	328
Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		5
Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		116
Commercial real estate loans | Non-farm/non-residential | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Non-farm/non-residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Non-farm/non-residential | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Non-farm/non-residential | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Non-farm/non-residential | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Non-farm/non-residential | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Non-farm/non-residential | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Construction/ Land Development | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Construction/ Land Development | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Construction/ Land Development | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Construction/ Land Development | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Construction/ Land Development | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Construction/ Land Development | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Construction/ Land Development | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Agricultural | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Agricultural | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Agricultural | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Agricultural | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Agricultural | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial real estate loans | Agricultural | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial real estate loans | Agricultural | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Residential Real Estate | Residential 1-4 family | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	249	299
Residential Real Estate | Residential 1-4 family | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		105
Residential Real Estate | Residential 1-4 family | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		9
Residential Real Estate | Residential 1-4 family | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Residential Real Estate | Residential 1-4 family | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	328
Residential Real Estate | Residential 1-4 family | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Residential Real Estate | Residential 1-4 family | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		116
Total real estate | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	249	299
Total real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		105
Total real estate | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		9
Total real estate | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Total real estate | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	328
Total real estate | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Total real estate | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		116
Consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	5	14
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Consumer | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Consumer | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		29
Consumer | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Consumer | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		5
Consumer | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial & Industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	0	0
Commercial & Industrial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial & Industrial | Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial & Industrial | Interest Only
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial & Industrial | Combination Interest Rate Reduction and Term Extension
Financing Receivable, Modifications [Line Items]
Payment default loans	$ 2	0
Commercial & Industrial | Combination Interest Rate Reduction and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		0
Commercial & Industrial | Combination Term Extension and Principal Reduction
Financing Receivable, Modifications [Line Items]
Payment default loans		$ 0

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